postfix+sasl+dovecot script help!

Hi everybody!

I am trying to get the solution for days now, and I don't know what to do really :S

I just want to write a script, what does automatically install postfix, dovecot, and it configures sasl authentication for the clients.

I'm here right now [the script!!]:

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http://pastebin.ca/1687824

[I have written the reference howto in the script.]

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I run it after a fresh Lenny netinstall, on VirtualBox.

If someone knows, what am I missing, please help me :\

I can see with "netstat -tulpn", that the server is listeing on port 993,955,25.

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1.) But: when I want to get the e-mails through imap, with Thunderbird, on another machine, it just waits, and waits, and waits...[and finally it gives this: "Connection to server debian.lan timed out."] :\

logs: mail.info log: http://pastebin.com/f6c486374 mail.log: http://pastebin.com/f6e60f9b other logs are empty

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2.) When I want to send a message from a testuser to a testuser, with Thunderbird, on the client, it just keeps asking for the password, when I want click send. :S

logs: mail.info: http://pastebin.com/f1bca774f mail.log: http://pastebin.com/f5c0be27c mail.warn: http://pastebin.com/f46806d2f other logs are empty

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Info about the os & softwares [e.g.: "dpkg -l | grep postfix"]: http://pastebin.com/f1d0cefd2

192.168.56.4 is the client 192.168.56.5 is the server [VirtualBox, Host-Only networking, they can ping each other]

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Later I want to use it with Squirrel Mail [plus spam filtering + antivirus], but first, I just want to get it work :(

Thank you for any help :S [_good_ docs, howtos, solution, or anything please! :S :( ]